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| Cosmic Key | |
| Type: | Technology |
| Continuity: | Marvel Universe |
| Aliases: | None |
| Availability: | Unique item |
| Owners: | Pro-Rata |
| 1st appearance: | Howard the Duck #1 |
The Cosmic Key is a fictional item featured in comic books published by Marvel Comics. It is part of the mainstream Marvel Universe and is associated with the Howard the Duck line of titles. It first appeared in Howard the Duck, Volume 1 #1 in January, 1976.